igneous
Pegmatite
Igneous Pegmatite
AI-generated identification · may be incorrectHardness of 6-7 on Mohs scale, coarse-grained texture with interlocking crystals, varicolored (pink K-feldspar, translucent quartz, black biotite mica), vitreous to pearly luster.
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Physical properties
Hardness of 6-7 on Mohs scale, coarse-grained texture with interlocking crystals, varicolored (pink K-feldspar, translucent quartz, black biotite mica), vitreous to pearly luster.
Formation & geological history
Formed from water-rich magma cooling slowly deep within the Earth's crust during the final stage of crystallization.
Uses & applications
Source of rare-earth elements, lithium minerals, gemstones, and industrial flux materials like feldspar and quartz.
Geological facts
Pegmatites can host exceptionally large crystals, sometimes growing several meters in length.
Field identification & locations
Identify in the field by its extremely large, coarse interlocking crystal grains compared to normal granite. Found globally in ancient cratons and mountain belts.
